González-Zamora, Pedro, David Aquino, Aarón Rodríguez, and Daniel Sánchez. 2023. “Mammillaria monochrysacantha (Cactaceae), a New Endemic Species from Guanajuato, Mexico”. Phytotaxa 618 (3). Auckland, New Zealand:243-53. https://doi.org/10.11646/phytotaxa.618.3.2.